<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="css/buttons.css">
</head>
<body>
    <button class="btn btn-lg">button</button>

    <button class="btn btn-small btn-waring">button</button>
    <button class="btn btn-waring btn-lg">button</button>

    <button class="btn btn-lg btn-info">info</button>

    <a href="#" class="btn btn-lg btn-info">info...</a>

    <div class="btn btn-lg btn-info">div-info</div>
</body>
</html>